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