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