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)(21,22)(23,28)(24,31)(25,27)(26,33)(29,34)(30,36)(32,35) involution — undirected(5,7)(6,9)(8,12)(10,11)(14,17)(18,20)(21,23,27,24)(22,28,25,31)(26,30,34,32)(29,35,33,36)(7,12)(9,10)(13,14,16,17)(15,18,19,20)(21,24,27,23)(22,28,25,31)(26,32,34,30)(29,35,33,36)(1,2,3,4)(5,7)(6,10)(8,12)(9,11)(21,25,27,22)(23,28,24,31)(26,33,34,29)(30,35,32,36)(5,6)(7,10)(8,11)(9,12)(13,15,16,19)(14,18,17,20)(21,26)(22,29)(23,30)(24,32)(25,33)(27,34)(28,35)(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.