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