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