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