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