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