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