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