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