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)(21,36)(22,35)(23,27)(24,32)(26,37)(29,42)(30,41)(31,43)(33,48)(34,45)(38,39)(40,46)(44,47) involution — undirected(1,3,5,11)(2,6,8,9)(4,12,13,10)(7,15,16,14)(17,18)(19,29)(20,35)(21,26)(22,25)(23,27)(24,34)(28,42)(30,39)(31,40)(32,45)(33,44)(36,37)(38,41)(43,46)(47,48)(17,19,30,46,22,33,21,32,23,34,37,47,20,31,38,42)(18,24,39,48,25,40,26,28,27,29,36,43,35,44,41,45)(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)(18,25,27,35)(19,31,34,33)(21,30,38,37)(24,40,29,44)(26,36,41,39)(28,43,45,48)(32,46,42,47)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.