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