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