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