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