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