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