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)(17,18,22,27,23,28,21,26)(19,29,31,39,32,42,37,24)(20,33,34,41,36,25,35,40)(30,44,46,38,47,43,45,48)(1,3,4,7)(2,5,6,8)(9,11)(10,13)(12,15)(14,16)(17,19)(18,24)(20,30)(21,31)(22,37)(23,32)(25,38)(26,29)(27,42)(28,39)(33,48)(34,45)(35,46)(36,47)(40,44)(41,43)(2,6)(5,8)(10,14)(11,15)(17,20)(18,25)(19,30)(21,35)(22,34)(23,36)(24,38)(26,41)(27,40)(28,33)(29,43)(31,46)(32,47)(37,45)(39,48)(42,44) involution — undirected(9,11)(10,13)(12,15)(14,16)(17,21,23,22)(18,26,28,27)(19,31,32,37)(20,34,36,35)(24,29,39,42)(25,40,33,41)(30,45,47,46)(38,44,48,43)(11,15)(13,16)(17,21,23,22)(18,26,28,27)(19,31,32,37)(20,35,36,34)(24,29,39,42)(25,41,33,40)(30,46,47,45)(38,43,48,44)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.