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