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