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