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