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