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