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