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)(13,14,17,20)(15,16,19,18)(21,22,25,27)(23,26,28,24)(5,7,10,12)(6,11,9,8)(21,23,25,28)(22,24,27,26)(5,8)(6,12)(7,9)(10,11)(13,15,17,19)(14,18,20,16)(21,24,25,26)(22,23,27,28)(1,2)(3,4)(5,8)(6,7)(9,12)(10,11)(13,14)(15,18)(16,19)(17,20)(21,22)(23,24)(25,27)(26,28) involution — undirected(5,9,10,6)(7,11,12,8)(13,16,17,18)(14,19,20,15)(21,23)(22,26)(24,27)(25,28)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.