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