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