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