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