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