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