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