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