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