One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,9)(6,15)(7,8)(10,12)(11,14)(13,16)(17,18,21,25)(19,24,27,22)(20,28,29,23)(26,30,32,31)(33,34,38,36)(35,39,41,42)(37,40,46,44)(43,47,45,48)(1,3)(2,5)(4,12)(6,13)(7,11)(8,14)(9,10)(15,16)(17,19)(18,22)(20,26)(21,27)(23,30)(24,25)(28,31)(29,32)(35,41)(39,42)(43,45)(47,48) involution — undirected(2,8)(3,11)(4,13)(10,15)(17,20,21,29)(18,23,25,28)(19,26,27,32)(22,30,24,31)(33,35)(34,39)(36,42)(37,43)(38,41)(40,47)(44,48)(45,46)(1,4,7,13)(2,9,8,16)(3,12,11,6)(5,10,14,15)(17,20)(18,23)(19,26)(21,29)(22,30)(24,31)(25,28)(27,32)(33,36,38,34)(35,42,41,39)(37,44,46,40)(43,48,45,47)(1,5)(2,3)(4,10)(6,16)(7,14)(8,11)(9,12)(13,15)(17,19)(18,24)(20,26)(21,27)(22,25)(23,31)(28,30)(29,32)(33,35)(34,39)(36,42)(37,45)(38,41)(40,48)(43,46)(44,47) involution — undirected(1,6,7,12)(2,10,8,15)(3,13,11,4)(5,9,14,16)(17,18)(19,22)(20,23)(21,25)(24,27)(26,30)(28,29)(31,32)(33,37)(34,40)(35,43)(36,44)(38,46)(39,47)(41,45)(42,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.