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