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