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