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