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