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