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