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