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