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