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