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