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