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