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