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