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