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