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