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)(23,29)(26,34)(30,36)(32,35) involution — undirected(5,7)(6,11)(8,15)(9,18)(10,16)(12,19)(13,14)(17,20)(21,22,24,27)(23,30,29,36)(25,33,31,28)(26,35,34,32)(1,2,3,4)(21,23,31,35,24,29,25,32)(22,26,33,36,27,34,28,30)(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)(21,23,31,35,24,29,25,32)(22,26,33,36,27,34,28,30)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.