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