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