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)(23,32)(24,31)(25,27)(26,30)(28,34)(29,33)(35,36) involution — undirected(2,3)(5,7,9,15)(6,10,11,13)(8,16,17,14)(12,20,19,18)(22,27)(23,33)(30,31)(34,35)(1,2,4,3)(21,23)(22,28)(24,34)(25,33)(26,35)(27,36)(29,31)(30,32)(6,11)(10,13)(12,19)(18,20)(21,23)(22,29)(24,35)(25,33)(26,34)(27,32)(28,31)(30,36) involution — undirected(1,3,4,2)(5,8,9,17)(6,12,11,19)(7,14,15,16)(10,18,13,20)(21,24,25,26)(22,30,27,31)(23,34,33,35)(28,32,36,29)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.