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