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