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