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