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