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