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