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