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