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