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