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