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