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