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