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