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