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