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