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