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