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