One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,8)(6,7)(9,14)(10,13)(11,15)(12,16)(17,18,23,25)(19,24,20,30)(21,26,27,22)(28,29,31,32)(33,34)(35,39)(36,42)(37,40)(38,41)(43,47)(44,48)(45,46)(2,7)(3,9)(4,11)(12,13)(17,19)(18,24)(20,23)(21,31)(22,29)(25,30)(26,32)(27,28)(35,36)(39,42)(43,44)(47,48) involution — undirected(2,7)(3,9)(4,11)(12,13)(18,25)(19,20)(21,27)(29,32)(33,35,38,36)(34,39,41,42)(37,43,46,44)(40,47,45,48)(1,3,6,9)(2,5,7,14)(4,10,11,16)(8,13,15,12)(17,20,23,19)(18,24,25,30)(21,31,27,28)(22,32,26,29)(33,36,38,35)(34,39,41,42)(37,44,46,43)(40,47,45,48)(1,4,6,11)(2,8,7,15)(3,10,9,16)(5,13,14,12)(17,21)(18,26)(19,28)(20,31)(22,25)(23,27)(24,29)(30,32)(33,34)(35,42)(36,39)(37,45)(38,41)(40,46)(43,47)(44,48)(1,5)(2,9)(3,7)(4,12)(6,14)(8,10)(11,13)(15,16)(17,22,23,26)(18,27,25,21)(19,29,20,32)(24,28,30,31)(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.