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