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