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