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