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