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