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