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