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