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