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