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