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)(21,22)(23,27)(24,32)(25,31)(26,29)(28,34)(30,33)(35,36) involution — undirected(1,2)(3,4)(5,7)(6,11)(8,15)(9,16)(10,17)(12,19)(13,14)(18,20)(21,23,26,25)(22,27,29,31)(24,30,35,34)(28,32,33,36)(2,4)(5,8,10,9)(6,12,13,18)(7,15,17,16)(11,19,14,20)(21,24,25,34,26,35,23,30)(22,28,27,32,29,33,31,36)(5,9,10,8)(6,12,13,18)(7,16,17,15)(11,19,14,20)(21,22)(23,31)(24,33)(25,27)(26,29)(28,35)(30,32)(34,36)(2,4)(7,17)(11,14)(15,16)(19,20)(21,23,26,25)(22,27,29,31)(24,30,35,34)(28,32,33,36)A 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.