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)(24,33)(25,28)(26,34)(27,31)(30,35)(32,36) involution — undirected(1,2,4,3)(5,6)(7,15)(8,12)(9,18)(10,13)(11,17)(14,16)(19,20)(21,23,25,31)(22,27,28,29)(24,30,34,36)(26,35,33,32)(5,7,9,19,10,16,8,17)(6,11,18,15,13,20,12,14)(21,24,33,22,25,34,26,28)(23,30,35,29,31,36,32,27)(1,3,4,2)(7,16)(11,20)(14,15)(17,19)(22,28)(24,34)(27,29)(30,36)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.